Problems Changing Name Server settings at Registrar

[x0v0x]

I have my IP address w/ corresponding url and can access both secure and normal WHM and CPanels.

But I am unable to change my DNS w/ registrar.
I have entered the straight IPs, have used the urls ie NS1.mydomain.com NS2.mydomain.com DNS1.mydomain.com DNS1.mydomain.com NameServer1.mydomain.com NameServer2.mydomain.com
even tried the IP addresses w/ NS1. in addition to the other prefixes above.

I keep getting an "Unavailable Error" message when I try to establish the new DNS when using the domain that was used for purposes of setting up the server. I am totally comfortable in making DNS changes, but my IP and the url that I'm using for cPanel, aren't being accepted. What am I missing??

[x0v0x]

I had a webmaster friend take a look at my WHM, and he said that it was sparse, "and he'd never seen anything like it before." Dedicated Server/WHM Lesson#1: Make sure that the guy who did the setup and who you are splitting the server with, gives you your controls. All of my problems and difficulties are a result of not being given the proper controls. It's been a kick spinning my wheels and jumping through hoops_ solitaire w/ half the cards missing. Needless to say, I have some feelings that I would like to express, after going in circles for the good part of the day, but will refrain.

[bhd]

If you are getting an "Unavailable Error" at the registrar that's exactly what it means - the names servers are not available/not reachable not working. Have you set them up??